Brush-drive for grain-cleaning machines.



No. 875,854. PATENTED JAN. 7, 1908. 0. H. SCOTT.

BRUSH DRIVB POR GRAIN CLEANING MACHINES;

APPLI CATION FILED SEPT.27, 1904.

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APPLICATION FILED SEPT. 27, 1904.

No. 875,854. PATENTED JAN. 7, 1908.

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GRAIN CLEANING MACHINES.

APPLICATION FILED SEPT.27, 1904.

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PATENT OFFICE.

CHARLES ll. SCOTT, 0F MINNEAPOLIS, MINNESOTA.

BRUSH-DRIVE FOR GRAIN-CLEANING MACHINES.

Specification of Letters Patent Patented Jan. 7, 1908.

Application filed September 27'. 1904. sci-a1 No. 226.101.

To all whom it may concern.

Be it known that I, CHARLES H. Soo'r'r, of Minneapolis, Hennepin county,lslinnesota, have invented certain new and useful Improvements inBrush-Drives for Grain-Cleaning Machines, of which the following is aspecification.

My invention relates to grain cleaning machinery, and particularly tobrushes 'or kecping the screens clear, and the object of the inventionis to provide a brush drive by means of which a uniform reciprocatingmotion will be imparted to the brushes back and forth across the undersurface of the screens. The brushes in general use for this purpose arenot very durable and have a tendency to become clogged with the materialpassing through the screens, and are thereby rendered less effective forthe purpose designed.

My invention permits the use of a brush wherein all danger of cloggingis avoided and a high standard of efficiency maintained.

A further object is to provide a brush drive that Will be simple andinexpensive to manufacture, and will require but little power to operateit.

The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In the accompanying drawings, forming part of this specification, Figureis a side elevation of a grain cleaning machine with my inventionapplied thereto. Fig. 2 is a plan section. looking at the top of thebrushes with the screens removed. Fig. 3 is a longitudinal verticalsection. Fig. 4 is a transverse vertical section.

In the drawing 2 represents the frame of the grain cleaning machinehaving the usual screens or sieves 3 and a plate 4 upon which. thematerial passing through the screens falls and is conducted out of themachine. .Below the screens I arrange a series of parallel rails 5 and 6extending horizontally across the machine. These rails are arranged inpairs there being one at the upper and another at the lower sideof themachine and two in the middle, as shown in Fig. 2. The rails arepreferably of metal and Vshaped in cross section, to present inclinedsurfaces to meet the grain falling through the screens and prevent itsbecoming lodged on the rails.

As shown in Fig. 3, a pair of rails is located I under each screen, ofwhich there may be several in each frame of different mesh according tothe character of the grain that is being cleaned. brush "frames orcarriages 7 having wheels 8 with hollow faces adapted to rest and travelupon the rails. There may be any desired number of these brush framesaccording to the size of the machine, but in this case I have shownfour, two upon one side of a dividing bar 9 which separates the upperrow of screens from the lower, and two upon the other side, those uponthe same bar 9 traveling upon the same pair of rails. The frames arelocated at a suitable distance apart, and those upon the same rails arecon nected by any suitable means as the chains 10. On one side of themachine idle rolls 11 are mounted, over which a flexible connection, asthe chain 12, passes, and has its ends attached to the contiguous brushframes, so that when the chain is moved it will drag one set of framesin one direction and allow the other set to be moved in the oppositedirection. ()11 the other side of the machine I provide similar idlerolls l3 and a chain 14 passing over them having its ends connected tothe contiguous brush frames and preferably providcd with springs 15designed to take up the slack in the flexible connections between theframes.

A shaft 16 is mounted in the frame of the machine and provided with alarge sprocket wheel 17 driven from a chain belt 18, and a belt 15)connects a smaller sprocket 20 on the shaft 16 with a similar sprocket21 on a shaft 22. This chain 19 operates in a direction substantially atright angles to the direction of movement of the brush frames andparallel with the belt or connection 14 between the idle wheels 13. Apin 23 connects the belt 14 with the belt 19, and when the latter isoperated the belt 14 will be driven first in one direction and then inthe other accordii'ig to the position of the pin connection L. Themovement of the belt 14 back and forth will result in dragging one setof brush frames across the screen in one direction and the other set offrames in the other direction, and this movement is continued as long asthe chain belt ll) is in operation. The brushes are thus keptreciprocating across the under surface of the screens keeping theirmeshes clear and insuring their operation at all times at a high degreeof efficiency.

Upon the rails I arrange I claim as my invention:

1. In a grain cleaning machine, the combination, with a frame, ofscreens mounted therein, brush frames arranged in pairs beneath saidscreens, brushes carried by said frames, means connecting the frame ofone pair with the other frame of the same pair, flexible meansconnecting the frame of one pair with the corresponding frame of theother pair on each side of the machine, a drive chain parallel with saidflexible connection, and means connecting said drive chain and one ofsaid flexible connections.

2. In a grain-cleaning machine the combination, with a frame, of ascreen supported therein, brush frames arranged to reciprocate beneathsaid screen, guides whereon said frames are movable,-a series of brushesmounted on said frames and adapted to sweep across the under surfaces ofsaid screen, idle wheels mounted in said machine frame at each end ofsaid guides, flexible means attached to said brush frames and.

passing around said idle wheels, whereby when one brush frame is movedin one direction the other brush frame will be moved in the oppositedirection, a drive belt arranged between the idle wheels on one side ofthe machine and operating in a plane substantially at right angles tothe plane of said brush frames and said idle wheels, and said drive belthaving a pivotal connection with one of said flexible connectionsintermediate to its ends, whereby the revolution of said drive belt willimpart a back and forth movement to said flexible connections and thereciprocation of said frames beneath said sieves, substantially asdescribed.

In witness whereof, I have hereunto set my hand this 14th day ofSeptember, 1904, at Minneapolis, Minnesota.

Rrormnn PAUL, C. MACNAMARA.

